function s1_hello(){
	echo "hello,world!"
}
function s2_tell_who_i_am(){
	echo "$(whoaml)"
}
function s3_which_distro_do_i_use(){
	cat /etc/*-release |grep "NAME"
}
function s4_view_my_cpu_arch(){
	uname -m
}
function s5_show_first_scsi_disk_size(){
	lsblk -l |grep disk |grep '^sda' |awk '{printf $4}' |tr -d 'G'
}
function s6_show_main_memory_size_in_megabytes(){
	free -m | grep "Mem:" |awk '{print $2+0}'
}
